Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f4da890e0e9e989…

MALICIOUS

PDF

44.5 KB Created: 2020-08-11 01:26:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eb79131e30f20fce0319cae7d081046c SHA-1: 6af670b3de4f69e900fbf824f928c2166f14e2b8 SHA-256: 5f4da890e0e9e98968ca8a70df2605cbf9a455d870ae2cdfd39c8cca95e046d0
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains a large number of embedded links, many of which point to external PDF files hosted on various domains. One of the primary links, https://ttraff.com/wb?keyword=mcgraw%20hill%20sat%202020%20pdf, is flagged as a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document appears to be a link farm designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.com/wb?keyword=mcgraw%20hill%20sat%202020%20pdf
    • http://files.champaignsoilandwater.com/uploads/1/3/0/7/130776055/8674749.pdf
    • http://files.shamrockhavenpublishing.com/uploads/1/3/1/3/131378943/3906494.pdf
    • http://ragon.westsoundstem.org/uploads/1/3/1/6/131606289/webos_xunatan.pdf
    • http://files.oregoncouponing.com/uploads/1/3/1/8/131871744/a1ef66fb45ecd1.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0437/8702/6581/files/45188285084.pdf
    • https://cdn.shopify.com/s/files/1/0428/1086/7871/files/23625889222.pdf
    • https://cdn.shopify.com/s/files/1/0427/9068/2783/files/18086859016.pdf
    • https://cdn.shopify.com/s/files/1/0437/5229/2513/files/49514522819.pdf
    • https://cdn.shopify.com/s/files/1/0429/5570/2425/files/46526674671.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/87664315042.pdf
    • https://cdn.shopify.com/s/files/1/0431/5742/2229/files/samsung_galaxy_s8_manual_verizon.pdf
    • https://cdn.shopify.com/s/files/1/0428/5438/3782/files/34850305171.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/51108684678.pdf
    • https://cdn.shopify.com/s/files/1/0428/7430/6727/files/catalogo_monedas_y_billetes_de_colombia_1616_a_2020.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005ea0.bin
b06580d257d8781c4f19143a39413590fec4e21e142e05ad497ee1c7a9b02fd2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5EA0 5244 bytes
font_01_sfnt_off00007097.bin
dce8159b04f7e324e2fb3cca1160b5150e22452ba80c4f8ca8d7862cd509fe42		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7097 11392 bytes
font_02_sfnt_off00009726.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9726 4324 bytes

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